Excessive hair fall after 2 years of PRP treatment and transplant for hair line. Should I be concerned?

I have been getting PRP injections since last year January 2021. I also got a transplant for my hair line. Since July of this year my hair started falling again. In august I got another PRP injection and then the last one was in October. However my hair is now falling even worse than before, the doctor said that’s is a rare case for this to happen but that my hair will grow back. But I still want a second opinion about this, is this normal?